Well today I planned to hardwire a FM Modulator into the HU-803 so I could have an Auxiliary Audio Input. Task one, was to get to the antenna connector on back of the HU-803 to insert the Adapter cables for the FM Modulator.
To get to the back of the radio you first have to remove the pen holder by carefully prying up the edges. I used a plastic knife so I would not scratch any thing.
You then remove the gear selector panel and remove the two screws behind the pencil holder at the base of the environmental control panel.
Now comes the tricky part. To remove the environmental control panel, you have to lift out from the bottom while you are pulling down and out from the top with a rocking motion simultaneously! It took me an hour to figure that out. Move the unit off to the driver side.
You then remove the two screws at the base of the radio
You then lift out on the bottom of the radio to clear the lip on top of the radio. Slide the radio and car phone out once you clear the lip.
Now for the bad news. You will notice the antenna input on back of the HU-803 has two antenna inputs. One for the left rear antenna and one for the rear bumper antenna. The adapter cables fit fine but only utilize one of the antenna inputs. If I used these adapters I would lose the diverse antenna signal capability. So I put everything back together and will have to look elsewhere to connect the FM modulator. I would bet if anyone had a FM modulator hardwired by a car stereo shop they are operating their radio with one of the antenna disconnected.